prope Property Test to Perform/explanation Rub on white tile, observe the color of the powder left behind Moh's hardness scale - A0perform a scratch test (fingernail, penny, steel file) Find mass per unit volume Observe with a lens - number of faces and the angles in which they meet Hit it with a hammer - even break along parallel planes/flat surfaces Hit it with a hammer - uneven break/irregular - not along flat surfaces Observe with your eyes the color of the mineral outward appearance Observe with your eyes how the light reflects off of the surface

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.